The Pro Nanotube is a smaller version of the Microtube. The rear part (the tag) is smaller and shorter than the Microtube's and has ridges to anchor a Hookguide - ideal for smaller flies. 14 pieces/package for floating tubes and 10 pieces for sinking. Watch a fly tying video. Note: A Pro Tubefly Needle (sold separately) is recommended for tying with Nanotubes. These tubes do not set well on most tube mandrels. Watch a video on tyng Scandi style tube flies with Nanotubes.